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Particular features of linear and nonlinear optical phenomena in magnetic borates (CuB2O4, Ni3B2O6)

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SEMINAR 

  Key Laboratory of Transparent Opto-functional Inorganic Materials 

  中国科学院透明光功能无机材料重点实验室 

  Particular features of linear and nonlinear optical phenomena in magnetic borates (CuB2O4, Ni3B2O6) 

  Speaker 

  R. V. Pisarev 

  Ioffe Physical Technical Institute of the Russian Academy of Sciences 

  St. Petersburg 194021, Russia 

  时间:20151126 下午1:30 

  地点:4号楼3楼会议室 

  联系人:武安华研究员(52414242 

  Abstract: 

  The talk will be devoted to spectroscopic studies of linear and nonlinear optical phenomena in antiferromagnetic borates CuB2O4 and Ni3B2O6. These crystals possess complex crystallographic and magnetic structures with magnetic ions occupying non-equivalent positions and competing exchange interactions. This results in several unusual features in their optical spectra in the infrared, Raman and visible-range spectra. In CuB2O4 we will discuss magnetic-field induced second harmonic generation; electronic transitions and genuine crystal-field parameters; lattice dynamics. Antiferromagnetic dichroism was studied in the vicinity of zero-phonon electronic transitions in this complex multisublattice magnetoelectric and was proven to be a sensitive tool for detecting magnetic transitions. 

  Brief Introduction: 

  Prof. Pisarev has experience in a variety of linear and nonlinear optical and magnetooptical techniques: optical absorption, Faraday rotation, magnetic circular and linear birefringence, ellipsometry, optical harmonic generation, time-resolved Faraday and Kerr rotation; pump-probe methods, Raman light scattering. His main research is devoted to solid state physics with emphasis on optical properties of magnetic crystals and films, semiconductor materials, ferroelectrics. 

  References: 

  1. M. Fiebig, Th. Lottermoser, D. Froehlich, A. V. Goltsev, and R. V. PisarevNature 419, 818 (2002) 
  2. A. V. Kimel, A. Kirilyuk, A. Tsvetkov, R. V. Pisarev, Th. Rasing, Nature 429, 850 (2004). 
  3. A. V. Kimel, A. Kirilyuk, P. A. Usachev, R. V. Pisarev, A. M. Balbashov, Th. Rasing, Nature 435, 655 (2004). 
  4. V. V. Pavlov, R. V. Pisarev, V. N. Gridnev, E. A. Zhukov, D. R. Yakovlev, and M. Bayer, Phys. Rev. Lett., v. 98, p. 047403 (2007).  
  5. A. V. Kimel, B. A. Ivanov, R. V. Pisarev, P. A. Usachev, A. Kirilyuk, Th. Rasing, Nature Physics, 5, 727 (2009) 
 
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